Fix incorrect normalization axis in v2.ElasticTransform (Fixes #9299)

[ericjaebeom]

This PR fixes a bug where horizontal/vertical displacements were normalized by the wrong spatial dimension (swapped height/width). Validated with reproduction script in Issue #9299. Fixes #9299

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9300

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